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我在我的 angular2 应用程序中有一项服务，称为HttpClient此服务应该为应用程序发送到我的端点的每个请求添加一个授权标头。

import { Injectable }    from '@angular/core';
import { Headers, Http, Response, } from '@angular/http';

import { Router } from '@angular/router';

import { ErrorService } from '../../services/error/error.service'

@Injectable()
export class HttpClient {

    private token: string;
    private error: any;

    private webApi = 'http://localhost:8080/api/v1/';    // Url to web api

    constructor(
        private http: Http,
        private router: Router,
        private errorService: ErrorService) { }

    get(url: string): Promise<Response> {
        return this.http.get(this.webApi + url, this.createAuthorizationHeader())
                    .toPromise()
                    .catch((e) => this.handleError(e));
    }

    post(url: string, data: any): Promise<Response> {
        return this.http.post(this.webApi + url, JSON.stringify(data), this.createAuthorizationHeader())
                    .toPromise()
                    .catch((e) => this.handleError(e));
    }

    put(url: string): Promise<Response> {
        return this.http.get(this.webApi + url, this.createAuthorizationHeader())
                    .toPromise()
                    .catch((e) => this.handleError(e));
    }

    delete(url: string): Promise<Response> {
        return this.http.delete(this.webApi + url, this.createAuthorizationHeader())
                    .toPromise()
                    .catch((e) => this.handleError(e));
    }

    private handleError (error: any) {

        var status: number = error.status;

        if (status == 415) {
            this.errorService.setError(error);
        }

        let errMsg = (error.message)
            ? error.message
            : status
                ? `${status} - ${error.statusText}`
                : 'Server error';

        console.error(errMsg); // log to console instead
        return Promise.reject(errMsg);
    }

    private createAuthorizationHeader() {

        let headers = new Headers();
        headers.append('Content-Type', 'application/json');
        headers.append('Accept', 'application/json');

        if (localStorage.getItem('token'))
            this.token = localStorage.getItem('token');

        headers.append('Authorization', 'Bearer ' + this.token);

        return headers;
    }
}

此外，此服务正在为另一个名为的自定义服务设置错误ErrorService

import { Injectable, EventEmitter }    from '@angular/core';

@Injectable()
export class ErrorService {

    error: any;

    public errorAdded$: EventEmitter<any>;

    constructor() {
        this.errorAdded$ = new EventEmitter();
    }

    getError(): any {
        return this.error;
    }

    setError(error: any) {
        alert('is not going to be called');
        this.error.error = error;
        this.errorAdded$.emit(error);
    }
}

这些服务将在我的 main.ts 中引导

...
import { ErrorService }   from './services/error/error.service';
import { HttpClient }   from './services/http/http.service';
...

bootstrap(AppComponent, [
    appRouterProviders,
    HTTP_PROVIDERS,
    ErrorService,
    HttpClient,
    ....
]);

现在我想在我的标题组件中显示这个错误。所以超时发生了一个错误，这个错误将显示在我的标题中的一个单独的框中。

问题是我ErrorService.setError(error)调用的方法HttpClient.handleError甚至不会被解雇。

4

1 回答 1

2 
.catch(this.handleError);

应该

.catch((e) => this.handleError(e));

保留参数列表this. where的范围(e)

或者，您可以使用

.catch(this.handleError.bind(this));
于 2016-07-22T10:38:02.940 回答